/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.metrics;



import com.google.auto.value.AutoValue;

import com.bff.gaia.unified.sdk.annotations.Experimental;

import com.bff.gaia.unified.sdk.annotations.Experimental.Kind;

import com.bff.gaia.unified.vendor.grpc.v1p13p1.com.google.common.collect.ImmutableList;



import java.util.List;



/**

 * The results of a query for metrics. Allows accessing all of the metrics that matched the filter.

 */

@AutoValue

@Experimental(Kind.METRICS)

public abstract class MetricQueryResults {

  /** Return the metric results for the counters that matched the filter. */

  public abstract Iterable<MetricResult<Long>> getCounters();



  /** Return the metric results for the distributions that matched the filter. */

  public abstract Iterable<MetricResult<DistributionResult>> getDistributions();



  /** Return the metric results for the gauges that matched the filter. */

  public abstract Iterable<MetricResult<GaugeResult>> getGauges();



  static <T> void printMetrics(String type, Iterable<MetricResult<T>> metrics, StringBuilder sb) {

    List<MetricResult<T>> metricsList = ImmutableList.copyOf(metrics);

    if (!metricsList.isEmpty()) {

      sb.append(type).append("(");

      boolean first = true;

      for (MetricResult<T> metricResult : metricsList) {

        if (first) {

          first = false;

        } else {

          sb.append(", ");

        }

        MetricName name = metricResult.getName();

        sb.append(metricResult.getKey()).append(": ").append(metricResult.getAttempted());

        if (metricResult.hasCommitted()) {

          T committed = metricResult.getCommitted();

          sb.append(", ").append(committed);

        }

      }

      sb.append(")");

    }

  }



  @Override

  public String toString() {

    StringBuilder sb = new StringBuilder();

    sb.append("MetricQueryResults(");

    printMetrics("Counters", getCounters(), sb);

    printMetrics("Distributions", getDistributions(), sb);

    printMetrics("Gauges", getGauges(), sb);

    sb.append(")");

    return sb.toString();

  }



  public static MetricQueryResults create(

      Iterable<MetricResult<Long>> counters,

      Iterable<MetricResult<DistributionResult>> distributions,

      Iterable<MetricResult<GaugeResult>> gauges) {

    return new AutoValue_MetricQueryResults(counters, distributions, gauges);

  }

}